CN102347718B - Bearingless switched reluctance generator - Google Patents
Bearingless switched reluctance generator Download PDFInfo
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- CN102347718B CN102347718B CN201110313992.XA CN201110313992A CN102347718B CN 102347718 B CN102347718 B CN 102347718B CN 201110313992 A CN201110313992 A CN 201110313992A CN 102347718 B CN102347718 B CN 102347718B
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Abstract
The invention discloses a bearingless switched reluctance generator. The generator is of a double-salient structure consisting of a stator iron core and a rotor iron core, wherein four suspension electrodes and four generating electrodes are arranged on the stator iron core at equal interval, and the generating electrodes are opposite pairwise in a radial direction; the width of a stator electrode of each suspension electrode is more than that of a stator electrode of each generating electrode, and the width of a rotor electrode is same as that of the stator electrode of each generating electrode; independent suspension windings are wound on the suspension electrodes respectively; and a drive winding and a generating winding are arranged on the generating electrodes respectively in a lap winding way, and two radial opposite windings are connected in series. According to the bearingless switched reluctance generator, the technical problem of non-linear strong coupling between suspending power and generating voltage is solved, the radial load capability is enhanced, and the suspension performance is improved.
Description
Technical field
The present invention relates to magnetic suspension switched reluctance motor field, relate in particular to a kind of bearingless switched reluctance generator, be particularly suitable for the electric energy compensation at renewable energy systems such as photovoltaics.
Background technology
By magnetic suspension bearing winding and motor stator winding regularly around together with, realize motor without bearing, this concept is put forward in late nineteen eighties by R.Bosch at first.After magnetic suspension asynchronous machine and magnetic suspension permanent magnet synchronous machine, magnetic suspension switched reluctance motor technology has also obtained research, its generating voltage is after rectification, filtering and voltage stabilizing, can when voltage ripple of power network or load variations, export substantially impregnable direct voltage, be specially adapted to the momentum compensation being incorporated into the power networks in regenerative resources such as photovoltaics, peak value regulates and load balance.
Traditional generator operation mode of magnetic suspension switched reluctance motor is periodicity timesharing power generation mode, for overcoming the limitation that its power density is low, the document " complete period is without the design of bearing bearingless switched reluctance generator " that is published in < < Proceedings of the CSEE > > for 2011 has been announced a kind of magnetic levitation switch magnetic resistance complete-period generator, it is characterized in that suspending windings is served as simultaneously suspends and two kinds of functions of excitation, and complete after excitation cut-off current in suspending windings, main winding afterflow generating.But the magnetic field that suspending windings and main winding produce, on magnetic circuit, influence each other, intercouple, between suspending power and generating voltage, there is complicated non-linear close coupling relation, the fluctuation that basic mathematic model changes with generator operating state very greatly, the difficulty that the Derivation of Mathematical Model of bearingless switched reluctance generator system, Nonlinear Decoupling and operation are controlled is very large, and suspension and power generation performance also have much room for improvement.
Application number is that the patent of invention " a kind of single-phase bearingless switched reluctance motor " of 200910263106.X has proposed a kind of single-phase bearing-free switch reluctance motor, it is characterized in that on all stator tooths, only having a set of winding, suspending power is produced by suspending windings electric current, torque is produced by torque current, suspending power and torque are full decoupled, and it is convenient to control.But during as generator operation, main winding is in front half period excitation, and the just afterflow generating of later half cycle, therefore can not all outwards export electric energy in the work period in whole phase, have the defect that power density is low.
Summary of the invention
Switch reluctance generator is hanged in a kind of magnetic suspension that the present invention seeks to propose to suspend and electricity generation system decoupling zero, radial suspension performance strengthen, and this generator has solved the low density problem of generated output.
Technical scheme of the present invention is: a kind of bearingless switched reluctance generator, by stator core and rotor core, form double-salient-pole structure, and four suspension utmost points and four generating utmost points are uniformly-spaced set in described stator core, the described generating utmost point is radially relative between two; It is wide that described suspension utmost point stator poles is wider than described generating utmost point stator poles, and rotor pole is extremely wide wide identical with described generating utmost point stator poles; Described suspension is extremely gone up and is wound with respectively independently suspending windings; Extremely upper while respectively of described generating lap wound excitation winding and generating winding, and two radially relative winding serial connections.
Further, described suspension utmost point stator poles is wide is the wide twice of described generating utmost point stator poles.
Further, described double-salient-pole structure is 8/10 utmost point, and described suspension utmost point stator poles is wide is
, described generating utmost point stator poles is wide is
.
The invention has the beneficial effects as follows:
(1) divide be arranged the suspension utmost point and the generating utmost point, clear in structure, definite functions
Stator poles is divided into the suspension utmost point and the utmost point that generates electricity, and suspending windings extremely goes up around suspension, and excitation and generating winding are extremely gone up around generating, clear in structure, and definite functions, maintenance and control are convenient.
(2) suspending power does not change with rotor position angle, improves the suspendability of motor
Eliminated the problem that traditional magnetic suspension switched reluctance motor rotor critical alignment position can not effectively produce suspending power, strengthen the radial load ability of motor, improve the suspendability of motor, this is that extremely descend the alignment area maintenance of stator poles, rotor pole to equal rotor pole wide because suspend, suspension utmost point magnetic linkage is not affected by rotor position angle, when given radial load winding current, in rotor rotation process, suspending power only has small fluctuation, can substantially keep invariable.This and traditional structure low suspension power are visibly different with the periodically variable phenomenon of rotor position angle.
(3) except rotor pole is with generating utmost point stator complete matching with do not line up completely position, there is generating voltage generation always
Generating winding magnetic linkage changes with the variation of position angle, during rotor pole and the incomplete aligned position of generating utmost point stator, there is not flat site in generating winding magnetic linkage, except rotor pole is with generating utmost point stator complete matching and do not line up completely position, to there is generating winding induced voltage to produce always, by controlling excitation in turn and the exciting current size of A, B two-phase excitation winding, get final product the generating voltage of continuous wave output expectation, improve generated output density, this is obviously difference and traditional periodically timesharing power generation mode.
(4) suspending power and generating voltage decoupling zero, be convenient to modeling and control
During given suspending windings electric current, in rotor rotation process, suspension utmost point magnetic linkage is about rotor position angle
variation very little, to generating the utmost point do not exert an influence.Due to this motor symmetrical structure form, generating utmost point winding suspends and extremely all produces symmetrical magnetic flux at each, and the combined influence of x, y direction of principal axis suspending power is approximately to zero, can ignore, and has eliminated the coupling influence of the suspension utmost point with the generating utmost point.
Table 1: suspending windings magnetic linkage and suspending power FEM (finite element) calculation value (record
place's suspending windings magnetic linkage
and radial load
)
 |
 |
 |
| -18 | 0.391883 | 19.104 |
| -17.1 | 0.391565 | 19.063 |
| -16.2 | 0.391721 | 19.155 |
| -15.3 | 0.391802 | 19.223 |
| -14.4 | 0.391733 | 19.225 |
| -13.5 | 0.391993 | 19.284 |
| -12.6 | 0.391891 | 19.231 |
| -11.7 | 0.391987 | 19.221 |
| -10.8 | 0.392055 | 19.156 |
| -9.9 | 0.392009 | 18.983 |
| -9 | 0.392301 | 19.023 |
| -8.1 | 0.391992 | 19.115 |
| -7.2 | 0.392057 | 19.024 |
| -6.3 | 0.392007 | 18.998 |
| -5.4 | 0.391861 | 18.977 |
| -4.5 | 0.392001 | 18.948 |
| -3.6 | 0.391787 | 18.987 |
| -2.7 | 0.391805 | 19.019 |
| -1.8 | 0.391756 | 19.021 |
| -0.9 | 0.391601 | 19.115 |
| 0 | 0.391901 | 19.001 |
Accompanying drawing explanation
Fig. 1 is the structural representation of the novel magnetically levitated switch reluctance generator of the present invention;
Wherein: 1, stator core; 2, rotor core; 3, the suspension utmost point; 4, the generating utmost point; 5, suspending windings; 6, excitation winding; 7, generating winding;
Fig. 2 is that the excitation winding magnetic linkage of bearingless switched reluctance generator of the present invention is with the change curve of exciting current;
Fig. 3 is that the excitation winding magnetic linkage of bearingless switched reluctance generator of the present invention is with the change curve of rotor position angle;
Fig. 4 is that the generating winding magnetic linkage of bearingless switched reluctance generator of the present invention is with the change curve of exciting current;
Fig. 5 is that the generating winding magnetic linkage of bearingless switched reluctance generator of the present invention is with the change curve of rotor position angle;
Fig. 6 is that the radial load of bearingless switched reluctance generator of the present invention is with the change curve of rotor position angle;
Fig. 7 is that the generating voltage of bearingless switched reluctance generator of the present invention is with the change curve of rotor position angle.
Embodiment
As shown in Figure 1, the structural representation of bearingless switched reluctance generator of the present invention, adopt the double-salient-pole structure of 8/10 utmost point, comprise stator core 1, rotor core 2, the suspension utmost point 3, the generating utmost point 4, suspending windings 5, excitation winding 6 and generating winding 7, the suspension utmost point 3 and the generating utmost point 4 are uniformly-spaced arranged in stator core 1, and the suspension utmost point 3 stator poles are wide
, the generating utmost point 4 stator poles are wide
, rotor pole is extremely wide
.On four suspension utmost points 3, be wound with respectively independently suspending windings 5, by each suspending windings 5 size of current of independent control to obtain required suspending power.
direction suspending power is by the electric current of suspending windings 5
with
control, when
during conducting, produce
positive direction suspending power, otherwise, when
during conducting, produce
negative direction suspending power; In like manner,
direction also can produce the suspending power of positive and negative direction;
direction and
direction suspending power can synthesize the suspending power of any direction, thereby the rotor of realizing generator is from suspending function, in figure
,
with
,
be respectively
,
axle positive direction and negative direction suspending windings inflow current;
,
with
,
be respectively
,
axle positive direction and negative direction suspending windings flow out electric current.On four generating utmost points 4, lap wound excitation winding 6 and generating winding 7 simultaneously respectively, it is a phase that two radially relative excitation windings 6 are connected in series respectively with generating winding 7, be divided into into A, B two-phase, by controlling the conducting in turn of two-phase excitation winding and the size of exciting current, the generating voltage of expectation can be obtained in generating winding, in figure
with
be respectively A phase and encourage mutually winding inflow current with B;
with
being respectively A phase encourages winding to flow out electric current with B mutually;
with
be respectively A phase and the B winding inflow current that generates electricity mutually;
with
being respectively A phase encourages winding to flow out electric current with B mutually.It is rotor position angle that definition rotor pole and A generate electricity when the utmost point aligns mutually
zero degree position, with counterclockwise for just.The alignment area of 3 times stators of the suspension utmost point, rotor equals the rotor facewidth all the time, suspending windings 5 magnetic linkages do not change with rotor position angle, illustrate that suspending power is not affected by rotor position angle, in rotor rotation process, can effectively produce suspending power all the time, and the electric current of suspending windings 5 changes not impact to generating utmost point magnetic linkage.
Fig. 2 and Fig. 3 are respectively excitation winding 6 magnetic linkages of bearingless switched reluctance generator of the present invention with the change curve of exciting current and rotor position angle.Exciting current and rotor position angle all have impact to excitation winding magnetic linkage, and along with the increase of exciting current and rotor position angle, excitation winding 6 magnetic linkages and exciting current will transfer non-linear relation to by linear relationship.
Fig. 4 is that generating winding 7 magnetic linkages of bearingless switched reluctance generator of the present invention are with the change curve of exciting current.Along with the increase of exciting current, excitation winding 6 magnetic linkages will be entered between inelastic region by linearity.
Fig. 5 is that generating winding 7 magnetic linkages of bearingless switched reluctance generator of the present invention are with the change curve of rotor position angle.Generating winding 7 magnetic linkages change with the variation of position angle, during rotor pole and the incomplete aligned position of generating utmost point stator, there is not flat site in generating winding 7 magnetic linkages, explanation is under structure of the present invention, except rotor pole is with generating utmost point stator complete matching and do not line up completely position, to there be generating winding 7 induced voltages to produce always, be very beneficial for improving the generated output density of magnetic levitation switch 6 reluctance motors.
Fig. 6 is that the radial load of bearingless switched reluctance generator of the present invention is with the change curve of rotor position angle.Given radial load winding current, in rotor rotation process, suspending power only has small fluctuation, can substantially keep invariable, this has guaranteed all can export constant suspending power in whole turn-on cycle, the suspendability of generator will be mentioned very large lifting, also for realizing the decoupling zero of suspending power and generating voltage, lays a good foundation.
Fig. 7 is that the generating voltage of bearingless switched reluctance generator of the present invention is with the change curve of rotor position angle.Further illustrate, except rotor pole is with the generating utmost point 4 stator complete matchings with do not line up completely position, will have generating voltage generation always.By controlling excitation in turn and the exciting current size of A, B two-phase excitation winding, can export the generating voltage of expectation, improve generated output density.
Reluctance generator of the present invention is divided into the suspension utmost point 3 and the generating utmost point 4 by stator poles, and suspending windings 5 is on the suspension utmost point 3, and excitation winding 6 and generating winding 7, on the generating utmost point 4, solve the technical problem of non-linear close coupling between suspending power and generating voltage; Strengthen radial load ability, improve suspendability; And can reduce rotor number of pole-pairs and power tube number, reduce circuit complexity.While having solved generating state operation, main winding must be in front half period excitation simultaneously, and the later half cycle could generate electricity in afterflow, cannot in the work period, all outwards export in whole phase electric energy so the low density technical problem of generated output.
Claims (3)
1. a bearingless switched reluctance generator, forms double-salient-pole structure by stator core and rotor core, it is characterized in that: four suspension utmost points and four generating utmost points are uniformly-spaced set in described stator core, and the described generating utmost point is radially relative between two; It is wide that described suspension utmost point stator poles is wider than described generating utmost point stator poles, and rotor pole is extremely wide wide identical with described generating utmost point stator poles; Described suspension is extremely gone up and is wound with respectively independently suspending windings; Extremely upper while respectively of described generating lap wound excitation winding and generating winding, and two radially relative winding serial connections.
2. a kind of bearingless switched reluctance generator according to claim 1, described suspension utmost point stator poles is wide is the wide twice of described generating utmost point stator poles.
3. a kind of bearingless switched reluctance generator according to claim 2, described double-salient-pole structure is 8/10 utmost point, described suspension utmost point stator poles is wide is
, described generating utmost point stator poles is wide is
.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110313992.XA CN102347718B (en) | 2011-10-17 | 2011-10-17 | Bearingless switched reluctance generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110313992.XA CN102347718B (en) | 2011-10-17 | 2011-10-17 | Bearingless switched reluctance generator |
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| Publication Number | Publication Date |
|---|---|
| CN102347718A CN102347718A (en) | 2012-02-08 |
| CN102347718B true CN102347718B (en) | 2014-04-09 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001433A (en) * | 2012-12-14 | 2013-03-27 | 江苏大学 | Stator hybrid short magnetic circuit magnetic suspension switched reluctance generator |
| CN104242495A (en) * | 2014-09-16 | 2014-12-24 | 广东威灵电机制造有限公司 | Motor stator and motor with motor stator |
| CN106953457B (en) * | 2017-04-11 | 2018-11-30 | 南京埃克锐特机电科技有限公司 | A kind of suspension of five-freedom degree magnetic switched reluctance motor system and its control method |
| CN110661467B (en) * | 2018-06-29 | 2021-09-14 | 北京自动化控制设备研究所 | Switched reluctance motor position estimation method based on flux linkage characteristic coordinate transformation |
| CN111682699B (en) * | 2020-05-17 | 2022-08-23 | 上海电机学院 | Magnetic suspension in-wheel motor with heat dissipation mechanism |
| CN112968559B (en) * | 2021-02-20 | 2023-06-09 | 上海隐冠半导体技术有限公司 | Magnetic levitation rotating device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201378761Y (en) * | 2009-02-27 | 2010-01-06 | 环一军 | Constant-voltage output mixing excitation type magnetic flux switching wind power generator |
| CN101710809A (en) * | 2009-12-16 | 2010-05-19 | 南京航空航天大学 | Single-phase bearingless switched reluctance motor |
| CN202261113U (en) * | 2011-10-17 | 2012-05-30 | 江苏大学 | Bearingless switched reluctance generator |
-
2011
- 2011-10-17 CN CN201110313992.XA patent/CN102347718B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201378761Y (en) * | 2009-02-27 | 2010-01-06 | 环一军 | Constant-voltage output mixing excitation type magnetic flux switching wind power generator |
| CN101710809A (en) * | 2009-12-16 | 2010-05-19 | 南京航空航天大学 | Single-phase bearingless switched reluctance motor |
| CN202261113U (en) * | 2011-10-17 | 2012-05-30 | 江苏大学 | Bearingless switched reluctance generator |
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